linux-kernel - [PATCH] docs: proc.rst: meminfo: briefly describe gaps in memory accounting

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Date:   Tue, 20 Apr 2021 11:51:05 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Jonathan Corbet <corbet@....net>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH] docs: proc.rst: meminfo: briefly describe gaps in memory accounting

From: Mike Rapoport <rppt@...ux.ibm.com>

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 Documentation/filesystems/proc.rst | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 48fbfc336ebf..bf245151645b 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -929,8 +929,15 @@ meminfo
 ~~~~~~~
 
 Provides information about distribution and utilization of memory.  This
-varies by architecture and compile options.  The following is from a
-16GB PIII, which has highmem enabled.  You may not have all of these fields.
+varies by architecture and compile options. Please note that is may happen
+that the memory accounted here does not add up to the overall memory usage
+and the difference for some workloads can be substantial. In many cases
+there are other means to find out additional memory using subsystem
+specific interfaces, for instance /proc/net/sockstat for networking
+buffers.
+
+The following is from a 16GB PIII, which has highmem enabled.
+You may not have all of these fields.
 
 ::
 
-- 
2.29.2